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PostgreSQL - max number of parameters in “IN” clause?
... planner more scope for
* optimization on such clauses.
*
* First step: transform all the inputs, and detect whether any are
* RowExprs or contain Vars.
*/
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How to get the index of an item in a list in a single step?
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Use the overload of Select which takes an index in the predicate, so you transform your list into an (index, value) pair:
var pair = myList.Select((Value, Index) => new { Value, Index })
.Single(p => p.Value.Prop == oProp);
Then:
Console.WriteLine("Index:{0}; Value: {1}"...
List comprehension in Ruby
...comprehension is. Every single response assumes some preexisting array to transform. But list comprehension's power lies in an array created on the fly with the following syntax:
squares = [x**2 for x in range(10)]
The following would be an analog in Ruby (the only adequate answer in this threa...
Please explain some of Paul Graham's points on Lisp
...nctions which manipulate Lisp data representing Lisp programmes and output transformed data representing transformed programmes, to be used in place of the originals? In other words -- why not allow Lisp programmers to register their functions as compiler plugins of sorts, called macros in Lisp? And...
CSS strikethrough different color from text?
... empty :after element and decorated one border on it. You can even use CSS transforms to rotate it for a slanted line. Result: pure CSS, no extra HTML elements! Downside: doesn't wrap across multiple lines, although IMO you shouldn't use strikethrough on large blocks of text anyway.
s,
strike ...
Is there YAML syntax for sharing part of a list or map?
...With no pure-YAML way to do this, I'm going to implement this as a "syntax transformation" sitting between the YAML parser and the code that actually uses the configuration file. So my core application doesn't have to worry at all about any human-friendly redundancy-avoidance measures, and can just ...
How can I convert an image into a Base64 string?
What is the code to transform an image (maximum of 200 KB) into a Base64 String?
14 Answers
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Large-scale design in Haskell? [closed]
...programs like system daemons in Haskell.
In the end, you live in a monad transformer stack. At the bottom is IO. Above that, every major module (in the abstract sense, not the module-in-a-file sense) maps its necessary state into a layer in that stack. So if you have your database connection co...
Most efficient way to reverse a numpy array
... np.fliplr(). Here is some code that demonstrates constructing a 1d array, transforming it into a 2d array, flipping it, then converting back into a 1d array. time.clock() will be used to keep time, which is presented in terms of seconds.
import time
import numpy as np
start = time.clock()
x = np....
Why is this program erroneously rejected by three C++ compilers?
...onal Standard does not specify
— the mechanism by which C programs are transformed for use by a data-processing
system;
— the mechanism by which C programs are invoked for use by a data-processing
system;
— the mechanism by which input data are transformed for use by a C program;
S...